Micrometer caliper



March 17, 1925- v P. J. DARLINGTON MI CROMETER CALI FER Filed May b, 1922 Patented Mar. 17, 1925.

UNITED STATES PHILIP J'. DARLINGTON, 0F BOSTON. MASSACHUSETTS.

IIGROMETER CALIPIEE.

Application Med May 5, 1922. Serial No. 558,824,

To 11N whom t may comarca:

Be it known that I, Fumar J. DAaILING- TON, a citizen of the United States` residing at West Cedar Street. in the city of Boston, county of Sutl'olk, and Starte of Massachusetts, .have invented a new and useful Micrometer Caliper. of which the following is a specification.

The inicnometer-caliper herein .described has `some features and isome .uses in common with the micrometer-caliper of .my application No. 535010 filed February 8, 1922, and my application #558,516, filed May 4, 1922.

My invention relates to improvements in micrometer-calipers designed for use in producing and for inspecting a dimension of an object, and especially' for .taking successive measunenien-ts of diameter during reduction of the diameter of an object toward a desired diameter and to within specified limits or tolerances above and below it.

The objects of my improvements are, first, to provide ya .niicrometer-caliper which .is rapid, accurate, and reliable in use and but little dependent upon ,the intelligence or skill `of the user; and, second, to provide a `micrometer-criliper which .can be cheaply andquicltly .adapted to man y uses and which is cheap to make and durable vin use.

The nature of my invention will be best understood by reference to the accompanying drawings, in which I have shown the preferred embodiment thereof and which will .now be described, it .being premised, however, that various Vchanges .can be made `in Kthe construction and arrangement of the various parts without departing from ,the spiritand `scope of the invention as defined tin the appe ed claims.

"Figure l .is an .elevation Niew, partly in section on the centerline ofthe fra-me and Ipartly .in section ,on vthe .dotted line 1 1, Eig. 9,; Figure 2, a yrear elevation view without the spindle :and plunger; and Fig. ,23, an elevation 'view of the frame and index dial.

Similar numerals refer to similar parts throughout the several views.

The frame 1 sldingly supports the measuring plunger 2, ywhich .is normally held in -the raised or open position by the arm 3, pivoted on the stationary ,pin 4, the angular position of wliicluarm is determined by :the angular position of the lever 5, which is also lpiftmted on the Ipin 4. .The spring 1 coiled about the pivot yieldingly presses the arm l, against the heel 7 of the lever '5. The arm 3 and lever 5 thus form a bellcrnnk which is r' id in the direction of movement of the ever 5 which tends to raise. fthe plunger 2, but which in the opposite direction yields to a pressure sufficient to overcome the tension of the spring (i. The operating lever .5 is normally held against the stop pin 36 by the spring Si. The push pin 9 detac'liably fastened to the free end of the lever '5 extends through 'the hole 10 in the frame 1 and serves when pushed in, by contact with the object being measured, or by manual operation, to displace the lever 5 against the spring 8 and let the free end of the arm Sewing down.

The plunger 2 is tubular and has an internal thread. Threaded throuvh the plunger and adjustable longitudinally with relation thereto is a contact spindle 11. The spindle is held in adjusted relation to the plunger by the friction of the inwardly 'bent segments 12 formed by splitting the upper end of the ,plunger 2. The arm 3 engages the plunger 2 in a slot 13 with a small end clearance 14, which permits a limited rotation of the plunger f2 in the frame 1.

The position of the plunger 2, relatively to the frame 1, is shown by the movable indicating member 15, which is connected to the plunger 2 through a multiplying device, preferably comprising the first and second pivoted arms 1G and 17 respectively, normally contacting with a knife edge 1S on the arm 3.

rl`he member 15 preferably has a counter- .balance ,'19 and a spring 2U vin tension to draw the member 15 in the opening direction of the inicrometer-caliper from the object to be measured. A toothless oi friction ratchet, preferably comprising the ball 21, wedging Ybetween the inclined block 22 and the member 15, is arranged to allow movement of the lever 15 in the direction corresponding to the downward or closing movement of therplunger E3, but to normally lock the member 15 in its ef'ort to follow an upward or opening' movement of the plunger 2. The forked and counterbalanced release lever 23 is normally held by the spring 21 against the ball 21 to force it into the lockingposition. The handle 25, carried by lever Q3, projects through the arc-shaped window 26 in l,position to `allow the member llO 15 tobe released by lifting the ball 2l by means of the forked lever 23.

The indicating member 15 carries a removable index plate 27 which is preferably marked with index lines 2S, 29 and 30, representing, respectively, the desired size and the smallest and largest tolerated sizes ot' the object being measured. The symbol 21. marked on the index plate 27, represents that combination of tolerances and mayv agree with a corresponding mark on a simplitied drawing of the object being measured. The lilies 28, Z0 and 30, on the index plate 27, read upon the graduated scale 3Q on the beveled edge 33 of the window 34 in ythe frame y`1. The graduations of the scale 32 are serially numbered in both directions from a zero line'35.

The operation of the device is as tollOWS:

The micrometer-caliper is placed upon a standard gage or object of the desired and the spindle l1 is adjusted until the mark 28 reads on the Zero line 35.

The micrometer-caliper is then placed upon the 'object to be measured rand the push-pin 9 is JIorcedmward. This through the jointed bell-crank causes the spindle ca rried by the plunger toyieldingly press against the object. The caliper is then manipulated, relatively tov the object, until the plunger 2 has been squared with, or has surely passed through a plane at right angles to, the object. The movements of the plunger are transmitted to the indieating member by the intermediatearms, the'leverage,of which is such that slight movements of the plunger are greatly vincreased in the indicating member. The ball 21 locks the indicating member 15 in the position of the smallest reading and the index member 15 remains in that position until manually released by means of the handle 25.

I claim:

1. In a micrometer-caliper the combination of ay frame, an adjustable'measuring member movably supported'by the frame. means mounted on the frame and actuated from the measuring member, said means being yielding to permit the'adjustment of said measuring member ontol the object to be measured, an indicating member` mechanism for transmitting and multiplying the movements of said yielding means to the indicating member, and locking means for retaining said indicating member in the position of lowest measurement..

2. In a micrometer-caliper the combination of a frame, an adjustable measuring member movably supported by the frame, an angle lever pivoted on the frame and actuated from the measuring member` said ylever being formed of two sections hinged together at the fulcrum of the lever, yielding `means engaging said sections and movably holding them in definite relation but permitting one section to be moved in one direction independently of the other sect ion in order to permit the adjustment of said measuring member onto the object to be measured. an indicating member. mechanism for transmitting and multiplying the movements of said angle lever to the indicating member, locking means for retaining said indicating member in the position ot' iowest measurement, and means for rele-.sing said locking means. i

In a micrometer-caliper the combination of a frame. a measuring member movably mounted on the frame, a contact meluber arranged to receive movement from the object to be measured` a yielding connection between the contact member and measuring means, an` indicating member, and means multiplying the movements ot' thc indicating member controlled by' the position of said yielding connection.

4, In a micrometer-caliper the combination of a frame, a measuring member movably supported by the frame, an indicatingl member movably mounted on the frame, means for actuating the indicating member from said measuring 1iie1nbe1,said means. multiplying the movements of the indicating member, and a friction ratchet engaging said indicating member to -'per1nit` its movement in one directiunionly. f

5. In a measuring Ydevice-a trame, a measuring means movably supported by ythiJ frame, an indicating means movably mounted on the'f'rame, means for locking said indicating means againstmovementiiny one direction, and a plurality ot' levers arranged intermediate the measuring means and the indicating means for transmitting and multiplying the movement ot the former to the latter means.

6. Ina micrometer-caliper the combination of a frame, a plunger slidably mounted in said rame,'a measuring member threaded into said plunger, an oscillating indicating member pivoted to the frame and adapted to co-operate with the measuring member, means in frictional engagement with said indicating member, said means permitting the indicating member to swing freely in one direction and locking it against swinging in the opposite direction whereby the indicating member will be detained in the position to which it is swung when coacting with the measuring member, anda plurality of cci-operating levers for transmitting and multiplying the movements of the plunger to the indicating member.

7. In a micrometer-caliper the combination of a frame` a tubular plunger slidably mounted inthe frame` a spindle threaded through the plunger, an indicating member pivoted to the frame and adapted to oo- IHM operate with the plunger, means in frictional engagement with the indicating member, said means permitting thi` indicating member to swing freely in one direction and locking it against swinging in the opposite direction whereby the indicating member will be detainel in the position to which it is swung when coacting with the plunger, and means for transmitting and multiplying the movements of the plunger to the indi'- eating member.

8. In a micrometer-caliper the combination of a frame. a tubular plunger slidably mounted in the trame. a spindle threaded through the plunger', an indicating lever, levers for transmitting the movements of the plunger to the indicating lever, and a rotatable clutch in frictional engagement with and designed to obstruct the movements of the indicating lever in one. direction.

9. In a micrometer-caliper the combination of a frame, a tubular plunger slidabl'v mounted in the frame, a spindle threaded through the plunger, a lever engaging the plunger, an indicating lever, means frictionally engaging and obstructing the movenient of the indicating lever in one direction, and a pluralityv of levers intermediate the plunger lever and indicating lever, for multiplying the movements of the plunger lever on the indicating lever.

10. In a micrometer-caliper the combination of a frame bearing a graduated scale, a plunger slidably mounted in the trame, a spindle threaded through the plunger, a bell-crank lever with a yielding joint at the angle pivoted to the frame and having one end engaged with the plunger and the other end provided with a push pin, a lever with an index reading with the scale on the trame, and multiplying levers interposed between an arm of the bell-crank lever and the index lever, whereby the movements of the plunger transmitted to the bell-crank lever are transmitted to and multiplied in the movement of the index lever.

11. In a micrometer-caliper the combination ot' a trame bearing a graduated scale, a plunger slidably mounted in the frame, a spindle threaded through the plunger, a bellcrank lever with a yielding joint at the angle pivoted to the frame and having one end engaged with the plunger and the other end provided with a push pin, a lever with an index reading with the scale on the trame, multiplying levers interposed between an arm of the bell-crank and the lindex lever, whereby the movements of the plunger through the bell-crank are transmitted to and multiplied in the movement of the index lever, and means for retaining the index lever against movement in one direction while permitting movement in the opposite direction.

l2. In a micrometer-caliper the combination of a frame bearing a graduated scale, a plunger slidably mounted in the frame, a spindle adjustable in the plunger, a bellcrank lever with a ielding joint at the angle pivoted to the trame and having one end engaged with the plunger and the other end provided with a push pin, a lever with an index reading with the scale on the frame, multiplying levers interposed between an arm of the bell-crank and the index lever, whereby the movements of the plunger through the bell-crank are transmitted to and multiplied in the movement ot the index lever, means for temporarily retaining the index lever against movement in one direction while permitting movement in the opposite direction, and means for releasing the index lever retaining means.

PHILIP J. DARLINGTON. 

